A Negative Effect of Niobium-Doped Ceria on Soot Oxidation Activity‡ ,Chemical Engineering & Technology

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A Negative Effect of Niobium-Doped Ceria on Soot Oxidation Activity‡
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2022-01-11 , DOI: 10.1002/ceat.202100523
Sunaina S Patil ₁ , Sahana Naik ₁ , Madhura D Ramesh ₁ , Harshini Dasari ₂ , Hari Prasad Dasari ₁

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Niobium-doped ceria catalysts were synthesized to study soot oxidation activity. X-Ray diffraction (XRD) and Raman analysis of the samples revealed the presence of a fluorite structure of CeO₂ for all the doped samples. The T₅₀ temperature of the pure CeO₂ sample was more significant than that of bare soot. The high catalytic activity of the CeO₂ catalyst can be attributed to the low crystallite size, high facet ratio, and the large Brunauer-Emmett-Teller (BET) surface area as compared to Nb-doped samples. The activation energy calculated by both Ozawa and KAS methods were found to be low for CeO₂ when compared to Nb-doped samples. CeO₂ resulted in better soot oxidation activity with low activation energy.

中文翻译：

铌掺杂二氧化铈对烟尘氧化活性的负面影响‡

合成铌掺杂二氧化铈催化剂以研究烟灰氧化活性。样品的X射线衍射(XRD)和拉曼分析揭示了所有掺杂样品都存在CeO _{2萤石结构。}纯CeO ₂样品的T ₅₀温度比裸煤烟更显着。_{与 Nb 掺杂样品相比，CeO 2}催化剂的高催化活性可归因于低微晶尺寸、高晶面比和大的 Brunauer-Emmett-Teller (BET) 表面积。与 Nb 掺杂样品相比，通过 Ozawa 和 KAS 方法计算的活化能对于 CeO _2较低。氧化铈₂导致更好的烟灰氧化活性和低活化能。

更新日期：2022-01-11

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